Is it considered acceptable to update the Vuex state solely by utilizing the payload parameter within a mutation?

Is it possible to iterate over Vuex data in a Vue file, identify the data that needs updating, and then pass that data to an action for committing, with the mutation handling the update?

I'm uncertain because standard Vuex mutations require a 'state' parameter, so I wonder if all the looping should be done within the mutation or if passing indexes would be more efficient for finding specific fields to change.

Here is a code example for reference:

someVueFile.vue

computed: {
    ...mapState({
      arrayOfObjects: (state) => state.someVuexStore.arrayOfObjects
    }),
},
methods: {
    myUpdateMethod() {
        let toBeUpdated = null;
        let newValue = "oneValue";
        this.arrayOfObjects.forEach((myObject) => {
            if (myObject.someDataField !== "oneValue") {
               toBeUpdated = myObject.someDataField;     
            }
        })

         if (toBeUpdated) {
             let updatedObject = {
                 updateThis: toBeUpdated,
                 newValue: newValue
             }

             this.$store.dispatch("updateMyObjectField", updatedObject)
         }
    }
}

someVuexStore.js

const state = {
  arrayOfObjects: [],
  /* contains some object such as:
    myCoolObject: {
      someDataField: "otherValue"
    }
  */
}

const mutations = {
  updateMyObjectField(state, data) {
    data.updateThis = data.newValue;
  }
}

const actions = {
  updateMyObjectField(state, data) {
    state.commit("updateMyObjectField", data);
  }
}

Answer №1

Indeed, it is perfectly acceptable to modify the state passed in through the payload argument instead of directly manipulating state in Vuex. Both methods essentially achieve the same result, as Vuex does not differentiate between the two approaches. Therefore, using the payload argument does not undermine the purpose of mutations.

To bolster this understanding, one can consider the objectives of mutations and why their usage is enforced. Essentially, mutations serve to maintain a centralized and traceable hub for clearly defined alterations to the application's state.

For instance, envision an application with countless components, each independently modifying the state without adhering to a mutation and doing so in varying manners. This scenario could potentially lead to a troubleshooting nightmare or render comprehension difficult for third-party developers due to the ambiguity surrounding state modifications.

Hence, mutations provide structure and establish a definitive method and location for state changes. Opting to solely utilize the payload argument within a mutation does not compromise these fundamental principles.

Answer №2

To consolidate all logic into a single action, consider destructuring the context object within the action itself:

actions: {
  myAction ({ state, commit, getters, dispatch }, anyOtherParameter) {
    let myVar = getters.myGetter // access data using a getter
    // perform necessary logic
    commit('myCommit', myVar) // make changes by committing
  }
}

If you prefer handling the logic in your component, it's possible to extract the getter and relevant code from the action.

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